CA2111936A1 - Focus Circuit - Google Patents

Focus Circuit

Info

Publication number
CA2111936A1
CA2111936A1 CA2111936A CA2111936A CA2111936A1 CA 2111936 A1 CA2111936 A1 CA 2111936A1 CA 2111936 A CA2111936 A CA 2111936A CA 2111936 A CA2111936 A CA 2111936A CA 2111936 A1 CA2111936 A1 CA 2111936A1
Authority
CA
Canada
Prior art keywords
voltage
focus
circuit
signal
variation component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2111936A
Other languages
French (fr)
Other versions
CA2111936C (en
Inventor
Masahiro Kawashima
Yutaka Tsutsumi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP3324207A priority Critical patent/JPH05161148A/en
Priority to US08/167,383 priority patent/US5434485A/en
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to CA002111936A priority patent/CA2111936C/en
Publication of CA2111936A1 publication Critical patent/CA2111936A1/en
Application granted granted Critical
Publication of CA2111936C publication Critical patent/CA2111936C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/26—Modifications of scanning arrangements to improve focusing

Abstract

In a focus circuit for cathode-ray tube (40) of electromagnetic focusing type, a DC voltage (B4) which is made by dividing CRT anode voltage (B3) by a voltage dividing circuit (27) is compared with a reference voltage (B6) by an anode voltage variation component detection circuit (29), thereby to output therefrom a signal (Ve) of anode voltage variation component. This signal (Ve) and static focus adjusting DC voltage (B7) are summed and amplified by an output amplifier 30, which issues a current for correcting focus to electromagnetic focusing coil (31).
CA002111936A 1991-12-09 1993-12-20 Focus circuit Expired - Fee Related CA2111936C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP3324207A JPH05161148A (en) 1991-12-09 1991-12-09 Focus circuit
US08/167,383 US5434485A (en) 1991-12-09 1993-12-15 Focus circuit
CA002111936A CA2111936C (en) 1991-12-09 1993-12-20 Focus circuit

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3324207A JPH05161148A (en) 1991-12-09 1991-12-09 Focus circuit
US08/167,383 US5434485A (en) 1991-12-09 1993-12-15 Focus circuit
CA002111936A CA2111936C (en) 1991-12-09 1993-12-20 Focus circuit

Publications (2)

Publication Number Publication Date
CA2111936A1 true CA2111936A1 (en) 1995-06-21
CA2111936C CA2111936C (en) 1998-05-26

Family

ID=27169670

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002111936A Expired - Fee Related CA2111936C (en) 1991-12-09 1993-12-20 Focus circuit

Country Status (3)

Country Link
US (1) US5434485A (en)
JP (1) JPH05161148A (en)
CA (1) CA2111936C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9309088D0 (en) * 1993-05-01 1993-06-16 Farnell Power Limited Feedback control loop circuits
KR100351384B1 (en) * 1996-05-31 2002-12-26 엘지이노텍 주식회사 Electronic focus circuit
JPH10112812A (en) * 1996-10-07 1998-04-28 Hitachi Ltd Display device
KR100480595B1 (en) * 2002-03-04 2005-04-06 삼성전자주식회사 Delay control circuit of dynamic focus signal and method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5796563A (en) * 1980-12-08 1982-06-15 Nec Corp Semiconductor device and manufacture thereof
US4642744A (en) * 1984-11-26 1987-02-10 Tektronix, Inc. Regulated high voltage supply
US4835668A (en) * 1987-03-23 1989-05-30 U. S. Philips Corporation Power supply with two output voltages

Also Published As

Publication number Publication date
US5434485A (en) 1995-07-18
CA2111936C (en) 1998-05-26
JPH05161148A (en) 1993-06-25

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed